Table § 18-29-608.1


Application for Backflow Preventers

Device

Degree of Hazard a

Application b

Applicable Standards

Air gap c

High or low hazard

Backsiphonage or backpressure

ASME A112.1.2

Antisiphon-type Water Closet Flush Tank Ball Cock

Low Hazard

Backsiphonage only

ASSE 1002

CSA CAN/CSA-B125

Reduced Pressure Principle Backflow Preventer

High or low hazard

Backpressure or backsiphonage

Sizes 1/4" to 10"

ASSE 1013

AWWA C511

CSA CAN/CSA B64.4

Reduced Pressure Detector Assembly Backflow Preventer

High or low hazard

Backsiphonage or backpressure

ASSE 1047

Double Check Backflow Prevention Assembly

Low hazard

Backpressure or backsiphonage

Sizes 3/8" to 16"

ASSE 1015

AWWA C510

Double Check Detector Backflow Preventer Assembly

Low hazard

Backpressure or backsiphonage (Fire sprinkler systems)

Sizes 1 1/2" - 16"

ASSE 1048

Dual Check Valve-Type Backflow Preventer

Low hazard

Backpressure or backsiphonage

Sizes 1/4" - 1"

ASSE 1024

Backflow Preventer with Intermediate Atmospheric Vents

Low hazard

Backpressure or backsiphonage

Sizes 1/4" - 3/4"

ASSE 1012

CSA CAN/CSA-B64.3

Dual Check Valve-Type Backflow Preventer for Carbonated Beverage Dispensers/Post Mix Type

Low hazard

Backpressure or backsiphonage

Sizes 1/4" - 3/8"

ASSE 1032

Pipe-Applied Atmospheric-Type Vacuum Breaker

High or low hazard

Backsiphonage only

Sizes 1/4" - 4"

ASSE 1001

CSA CAN/CSA-B64.1.1

Pressure Vacuum Breaker Assembly

High or low hazard

Backsiphonage only

Sizes 1/2" - 2"

ASSE 1020

Hose-connection Vacuum Breaker

High or low hazard

Backsiphonage

Sizes 1/2", 3/4", 1"

ASSE 1011

CSA CAN/CSA-B64.2

Vacuum Breaker Wall Hydrants, Frost-Resistant, Automatic Draining Type

High or low hazard

Backsiphonage

Sizes 3/4", 1"

ASSE 1019

CSA CAN/CSA-B64.2.2

Laboratory Faucet Backflow Preventer

(Non-testable)

Low hazard

Backsiphonage

ASSE 1035

CSA B64.7

Hose Connection Backflow Preventer

(Non-testable)

Low hazard

Low head backpressure, rated working pressure

backpressure or backsiphonage

Sizes 1/2" - 1"

ASSE 1052

Spill-proof vacuum breaker

High or low hazard

Backsiphonage only

Sizes 1/4" - 2"

ASSE 1056

For SI: 1 inch = 25.4 mm

a ) Low Hazard - See Pollution (Section 202) and Department of Water requirements

High Hazard - See Contamination (Section 202) and Department of Water requirements

b ) See Backpressure (Section 202)

See Backpressure, Low Head (Section 202)

See Backsiphonage (Section 202)

c) Break tank

d )For systems using non-food grade chemical additives